100 



b. Nuchal and dorsal crests separated. ^ Vri^ 



■••■ Ventral scales smooth \o. G. vtegalepis^ p. 107. ^tt\r-»-<=' 



■s? Ventral scales keeled 11. 6". Jilophns^ p. 108. N*-^ ^>^-<fr^~^-^ 



II. Dorsal scales equal. 



'■i'o y^v'^ '^ 

 a. Ventral scales smooth 12. G. gra?idis., p. 109. 



li. Ventral scales keeled. 



1. Below the ear some large, fiat scales. (V< »A.-«-<-i^ 

 ■j- Crest continuous 13- G- binotatus.^ p. iio. vi **^ 



tt Crest subcontinuous, with a notch 

 above the shoulder. 



a. Gular scales smooth; dorsal crest 

 lower than nuchal ; tympanum 



smaller than eye-opening ; gular .-^ 



fold black or grey 14. 6^. mgrigularts., p. III. • 



b. Posterior gular scales keeled ; dorsal 



crest higher than nuchal; tympanum \4(Uti ^'**"*-^'*> 



larger than eye-opening 1$. G. godeffroyi.^ p. 112. "^^ *'1vuli**-^ 



ttt Crests separated 16. 6^. papitensis.^ p. 113. 1^ 



2. No large scales below the ear. 



a. Nuchal crest low, formed of 4 — 6 

 widely separated scales ; dorsal crest 



indistinct: gular scales very small, a 



granular; dorsal scales small, keeled 17. G. modesfns., P- II3- 



b. Nuchal and dorsal crests continuous, 



latter lower; gular scales small, keeled ; . 



dorsal scales strongly keeled 18. C geclvinhanus.^ p. 114. r* 



c. Nuchal and dorsal crests low, sub- 

 continuous ; gular scales small, smooth ; 

 dorsal scales small, keeled ; a black , -^ ^.y_t»~L-.^ 

 spot on each side of the head. ... 19. C anritus., p. 115. 



d. Nuchal and dorsal crests subcontinuous, 

 notched, latter lower ; gular and dorsal 

 scales small, -almost smooth 20. 6". bniyni., p. Ii5- "^ 



I. Gonyocephalus doriae Peters, 



Gonyocephalus Doriae., Peters, Mon. Berl. Ac. 1871. p. 570; Ann. Mus. Civ. 



Genova III 1872, p. 28, pi. Ill, fig. i. 

 Gonyocephalus doriae., Boulenger, Cat. Liz. I 1885, p. 284. 



Snout slightly longer than the diameter of the orbit ; canthus 

 rostralis strongly projecting; supraciliary borders strongly raised, 

 forming an angle in its posterior part; tympanum distinct, 

 smaller than the eye-opening. Head-scales small, smooth ; no 

 enlarged scales on the temple; twelve upper and lower labials. 



